Are we alone in the universe? This is the question at the heart of the work carried out by the SETI (Search for Extraterrestrial Intelligence) community, which has been trying to capture signals of extraterrestrial intelligence with huge radio telescopes since the 1960s. Since 1977, a golden gramophone record has been travelling through space. The Voyager record contains greetings in 55 languages and music from Mother Earth. 30 years later, some researchers even want to load human DNA on a rocket. But this plan is causing trouble. In a worst case scenario, we are inviting hostile invaders to take control over the earth.